Issues : Omission of current key accidentals

b. 167

composition: Op. 50 No. 3, Mazurka in C♯ minor

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On the 2nd beat of the bar in AI, there are no naturals lowering f to f and d1 to d1. Chopin's inaccuracy is proven by an analogy with b. 159, by the presence of d both in the D major key in b. 165 and F major key starting from the 2nd beat of b. 166 and, above all, by the presence of these naturals in all the remaining sources.

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , Omission of current key accidentals

b. 171

composition: Op. 50 No. 3, Mazurka in C♯ minor

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AI is lacking in the  lowering d1 to d1. We regard it as the composer's oversight – after two multiple progressions, in which the 1st note of the bar is a fourth higher than the preceding one, Chopin could have considered d1 to be obvious here.

category imprint: Interpretations within context; Differences between sources

issues: Omission of current key accidentals